(A) Pneumatic bones are hollow,air-filled bones that reduce body weight,which is an essential adaptation for flight in birds.Among the given options,t

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(A) Pneumatic bones are hollow,air-filled bones that reduce body weight,which is an essential adaptation for flight in birds.Among the given options,the pigeon ($Columba$ $livia$) belongs to the class $Aves$.Birds possess pneumatic bones to facilitate flight.Therefore,the correct answer is $A$.